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US6751334B2 - Electromagnetic vibrator - Google Patents

Electromagnetic vibrator Download PDF

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Publication number
US6751334B2
US6751334B2 US10/237,391 US23739102A US6751334B2 US 6751334 B2 US6751334 B2 US 6751334B2 US 23739102 A US23739102 A US 23739102A US 6751334 B2 US6751334 B2 US 6751334B2
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United States
Prior art keywords
flux
yoke
bobbin body
air gaps
signal
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Expired - Lifetime
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US10/237,391
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US20030034705A1 (en
Inventor
Bo Hâkansson
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Osseofon AB
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Osseofon AB
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Assigned to OSSEOFON AB reassignment OSSEOFON AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAKANSSON, BO
Publication of US20030034705A1 publication Critical patent/US20030034705A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00—Transducers of moving-armature or moving-core type
    • H04R11/02—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H04R9/066—Loudspeakers using the principle of inertia
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/13—Hearing devices using bone conduction transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/006—Interconnection of transducer parts

Definitions

  • the present invention relates to a bone transmitting hearing aid/bone transmitting vibrator for generating or monitoring vibrations in accordance with the variable reluctance principle comprising a coil for generating/monitoring a magnetic signal flux, a bobbin body of a magnetic conductive material, one or more yokes of magnetic conductive material, and one or more permanent magnets for generating a magnetic biassing flux.
  • Bone transmitting hearing aids are used by patients who can not use conventional air transmitting hearing aids e.g., due to chronic middle ear disease or a congenital/acquired deformity.
  • a traditional bone transmitting hearing aid consists of a bone transmitting vibrator enclosed in a polymer shell which is pressed with a constant pressure of 3-5 Newton against the skin over the bone behind the ear.
  • Microphone, amplifier, and current source are placed in their own enclosure at a suitable site and at a secure distance from the vibrator to avoid feed-back coupling problems.
  • the most essential drawbacks of this type of bone transmitting hearing aids is that it is uncomfortable to wear due to the constant pressure and that the soft skin over the bone deteriorate the transmission of vibrations to the bone.
  • a bone anchored hearing aid (BAHA)—where the bone transmitting vibrator is connected directly to the bone via a skin penetrating and bone anchored implant of titanium, cf e.g., SE-A-81 07 161-5, SE-A-94 04 188-6 or Tjellström & H ⁇ kansson,
  • the Bone Anchored Hearing Aid Design principles, indications, and long-term clinical results, Otolayngol. Clin. N. Am. Vol. 28, No. 1, (1995). In this way a bone transmitting hearing aid is obtained which provides for higher amplification, pretty carrying comfort, and where all parts can be enclosed in the same housing.
  • the vibrator can be implanted completely and thereby skin and soft tissue can remain intact. Signal and necessary energy can in this case be transferred through intact skin by means of inductive connection. At more severe hearing damages where the energy demand is large the energy can be transferred by means of skin penetrating (percutaneous) electric connection device, cf e.g., SE 9704752-6.
  • skin penetrating (percutaneous) electric connection device cf e.g., SE 9704752-6.
  • BAHA vibrators in general and implantable ones in particular are (1) efficient, to keep current consumption down, (2) small, in order to be able to be placed in the temporal bone, and (3) reliable, as a repair/exchange of the vibrator requires a surgical incision.
  • the need to improve conventional bone transmitting hearing aids in the above mentioned respects is perhaps the most important motif behind the present invention.
  • the vibrator used at bone transmitting audiometry is of the same kind as used for bone transmitting hearing aids with the difference that the audiometry vibrator shall be capable of determining bone thresholds down to 250 Hz. It is commonly known the vibrators of today to be used in audiometry, e.g., B71 from Radio Ear, shows dissatisfactory high distorsion at low frequencies due to an intrinsic problem of this construction. Thus even here there is a great demand for improving the technology.
  • Vibrators based on piezo electricity, magnetostriction (magnetic elongation), and electromagnetism of the moving coil type are not used in bone transmitting hearing aids or audiometry vibrators mainly due to bad response at low frequencies.
  • the devices used are electromagnetic vibrators of the variable reluctance type.
  • FIG. 1 A cross-section of a conventional (State of the Art) vibrator of variable reluctance type of hitherto known type is shown in FIG. 1 .
  • the vibrator of FIG. 1 is substantially circularly symmetric. It consists of on one hand an annular permanent magnet, a coil coiled around an annular bobbin body, as well, and a counter mass connected in a suitable manner to a rigid unit (lower part), and on the other hand of a vibrator plate connected with a spring elemnt and a suitable adapter for connection to the load (top part).
  • the bobin body and the vibrator plate are made of magnetic field well conductive material, suitably special treated soft iron.
  • the vibrator plate functions as a yoke closing both the static (biassing) magnetic flux ⁇ 0 generated by the permanent magnet and the signal flux ⁇ _ generated by a signal current flowing through the coil.
  • the total development of force in the air gap is determined under certain presumptions approximatively by
  • ⁇ 0 2 represents the static force of the permanent magnet
  • the term 2. ⁇ . ⁇ 0 represnts the useful signal flux
  • the term ⁇ 2 represents a non-desired distortion.
  • the primary task of the counter mass is to add mass to obtain a suitable resonance frequency fr according to the relation
  • m is the mass of the lower part of the vibrator (including the outer rigid part of the spring element) and c is the compliance (resilience) of the spring element.
  • m is the mass of the lower part of the vibrator (including the outer rigid part of the spring element) and c is the compliance (resilience) of the spring element.
  • the mass m is called the counter holding unit.
  • the resonance frequency may, e.g., in accordance with Equ. 2 be lowered by increasing the weight of the counter holding unit (m) or increasing the compliance of the spring element (c).
  • a spring element that keeps the parts apart.
  • This spring element consists normally of a plate spring package with or without dampening coating as described in SE-A-85 02426-3. In resting condition which corresponds to an air gap of 50 to 100 nm the spring is so bent out to such a degree that its returning force exactly balances the attracting force of the permanent magnet. The Attraction force of the permanent magnet thus all the time strives to reduce the air gap created by balancing the magnet force and the spring force. Ageing of the spring as well as outer mechanical strains may thus lead to that the air gap of the vibrator collapses. If this should occur the sound of the vibrator becomes strongly distorted and the vibrator has to be repaired.
  • transducers are adapted to drive a light weight membrane for air borne creation of sound and the construction can not be transferred to a bone transmitting vibrator the load and working conditions (i.e. the skull bone) differ considerably from air.
  • the signal flux is hereby not only lead through the soft iron material and the air gap but also through the permanent magnet material which as a rule possesses a high reluctance (magnetic flux resistance) relative to the soft iron material.
  • the proposed invention is a new vibrator of variable relectance type which is characterized in that the signal flux is closed through the bobbin body and yoke as well as by two or more common air gaps where biassing flux and signal flux cooperates for generating the signal force.
  • Both the bobbin body and yoke are made of material which leads magnetism very well, such as e.g., specially prepared soft iron material.
  • the permanent magnets generating biassing flux can be placed in many different ways under the condition that the biassing flux in each embodiment is led in such a way that it cooperates with the signal flux in the air gaps for generating the signal force in accordance with Equ. 1.
  • the signal flux in the proposed solution herein, is closed through the soft iron material and air gaps without passing the permanent magnet(s).
  • One advantage using this solution is that the efficiency of the vibrator is improved as the permanent magnets, as mentioned above, in general have bad dynamic (signal providing) properties compared with the soft iron material.
  • the static flux cooperates in the air gaps according to the principle of Abalanced armature@ so that the static forces eliminates each other.
  • the vibrator can be made smaller for a given resonance frequency as the returning spring (the spring element) can be softer as it need not counteract any static force in the neutral position and the counter mass can thus be lighter, i.e., smaller to a corresponding degree.
  • the return to neutral position is secured by one or more spring elements.
  • the spring elements can e.g., consist of plate springs with or without dampening coating.
  • the air gap can be provided small elastic pillows to provide for a progressive resiliency which also provides a soft restriction (compression) of high sounds. The pillows in the air gap counteracts the possibility to air gap collapse as well.
  • the coil and the permanent magnet(s) as different from known technology, been split in a new way which has been made possible due to the balanced hanging.
  • the generation of the magnetic signal (coil and bobbin body) flux is carried out, and in the other unit the generation of the magnetic biassing flux (permanent magnet(s) and yoke) is carried out.
  • the spring element connects the two units while observing, as described above, that it is formed two or more air gaps between the units where the static forces are outbalanced and where magnet bias and signal flux cooperate for generating the signal force.
  • the advantage splitting the units in this way is that vibrational stress on the thin connecting lines to the coil become minimal as the coil via the bobbin body is connected to the skull bone which has a very high mechanical impedance (Hakansson et al, The mechanical point impedance of the human head, with and without skin penetration, J. Acoust. Soc. Am., Vol. 80, No. 4, October 1986).
  • the counteracting unit will swing with relatively large amplitudes while the coil moves relatively little and transfers, mainly, forces only. High reliability when it comes to the durability of the lines of the coil will be of utmost importance when the vibrator is implanted.
  • the application of the invention is not restricted to bone transmitting hearing aids but can, with advantage, also be used as audio metry vibrator and other loudspeaker applications as well as vibration provider.
  • FIG. 1 Prior art—cross-section of a conventional variable reluctance vibrator
  • FIG. 2 Cross-section of a first embodiment of the invention
  • FIG. 3 Details of the first embodiment
  • FIG. 4 A second and preferred embodiment of the invention
  • FIG. 5 A general embodiment showing different magnet positions
  • FIG. 6 A general embodiment showing Aouter@ air gaps only.
  • FIG. 2 A first embodying example according to the present invention is shown in FIG. 2 .
  • the picture of the embodiment has a substantially circular symmetry.
  • the vibrator consists of a generation unit 1 of signal flux and a biassing flux unit 2 which are elasticly bound to each other by means of a plate spring element 3 and a guiding spring 4 .
  • the generation unit of signal flux 1 consists of a bobbin body 5 , adapter yoke 6 , and a coil 7 , all been fixedly attached to each other.
  • the fact that the upper arm of the bobbin body 5 is shortened for being adaptable to the adapter yoke 6 is only dependent upon the fact that it shall be simple to mount the circular yoke 9 .
  • the biassing flux unit 2 consists of permanent magnet 8 , yoke 9 , bottom plate 10 , pole 11 , and counteracting mass 12 , all fixedly connected to each other. Between the generation unit 1 of signal flux and the biassing flux unit 2 there are created circular radially extending axial air gaps 13 a and 13 b , through which the biassing flux ⁇ 0 and the signal flux ⁇ _ are led in such a way that the axial forces in the air gaps, acting between the units, works in push-pull mode.
  • the term axial direction means the direction which is parallel to the direction shown by the double directed arrows which shhow the direction of the signal force (F signal ) of FIGS. 1-6.
  • F 2 ⁇ ( ⁇ 0 2 - ⁇ - ) 2 ⁇ 0 2 4 - ⁇ - ⁇ ⁇ 0 + ⁇ - 2 Equ . ⁇ 4
  • the signal flux is substantially closed through soft iron 5 , 6 , 9 without passing the permanent magnet 8 .
  • the signal flux way around the coil also shortest possible which is important to reduce the iron losses.
  • the permanent flux ⁇ 0 can be controlled by varying the thickness of the radial air gap 14 .
  • the connecting lines of the coil is soldered to the circuit board 15 .
  • the coil and coil lines are fixedly connected to the adapter yoke, which in turn is conected to the skull bone which has a very high mechanical impedance, the mechanical stress on the coil lines will be minimized. That part of the vibrator which will show large vibration amplitudes is the rigid and vibrational insensitive counteracting unit.
  • the air gaps 13 a and 13 b can be provided with cushions of a suitable elastic materil 15 , e.g., silicone rubber, which prevents collapse of the air gap.
  • a suitable elastic materil 15 e.g., silicone rubber
  • the air gaps can be formed by somewhat inclined surfaces in order to better distribute the magnetic fluxes in the air gaps and to prevent air gap collapse.
  • the coil 7 can be fixedly attached in a simple way to the yoke 9 in stead of to the bobbin body 5 using a suitable glue.
  • Connection to the load can be made either via the signal flux unit 1 or the biassing flux unit 2 .
  • the load e.g., a titanium fixture implanted into the temporal bone or the house in an audiometry vibrator
  • the biassing flux unit 2 can be made either via the signal flux unit 1 or the biassing flux unit 2 .
  • FIG. 2 a connection to the signal flux unit is shown only.
  • the vibrator it is supposed to be completely circular symmetric but it can likewise be rectangular symmetric.
  • the yoke 9 and the permanent magnet 8 are divided into two parts.
  • the one pair of the yoke and the permanent magnet (now being rectangular as to their form) is fitted into the left opening of the bobbin body and the other pair of yoke and permanent magnet is fitted into the right opening in the same way as shown by the cross-section of FIG. 2 .
  • FIG. 4 there is shown a second and preferred embodying example which completely or partly solves the drawbacks of the first embodiment.
  • the vibrator has hereby a rectangular symmetry but can also be realized using circular symmetry.
  • the now totally integral H-formed bobbin body 20 is elastically hanged using two spring elements 21 to the biassing flux uunit 22 .
  • the biassing flux unit consists of two yokes 23 , four magnets 24 a, b, c, d , four biassing yokes 28 a, b, c, d , and a counter acting mass 25 .
  • Each magnet biases the neighbouring inner air gap 26 a, b, c, d , but the biassing flux runs through the outer air gaps 27 a, b, c, d , and the through the bias yokes 28 a, b, c, d , as well.
  • the spring element 21 can be made as plate springs with or without dampening coating.
  • One or more of the air gaps can also here be provided with an elastic material e.g., silicone rubber to prevent air gaps collapse (not shown in FIG. 4 ).
  • the circuit board 29 for soldering the lines of the coil 7 to, is fixedly connected to the bobbin body to avoid unnecessary vibrational stress on the connecting lines.
  • An substantial advantage using this embodiment compared to the one according to FIG. 2 is that the mounting becomes easier and that the trimming of suitable air gaps and bias flux to provide a stable and optimal signal force development is facilitated.
  • the air gaps can be inspected from the outside as well.
  • the vibrator can be housed in a shell 30 of a tissue compatible material e.g., titanium.
  • the housing consists, suitably, of two halves which are laser welded together (not shown in FIG. 4 ).
  • the shell has a protrusion 31 with e.g., threads 32 for connection to the load.
  • the permanent magnets can, to produce a static flux, be placed in a number of different ways.
  • the magnets besides the positions 24 a, b, c, d , also be placed according to 40 a, b, c, d or 41 a, b , in FIG. 5 or according to 50 a, b, c, d , of FIG. 6 .
  • the embodiments according to FIGS. 5 and 6 can have rectangular or circular symmetry.
  • FIGS. 2, 4 and 5 have a H-shaped bobbin body where the signal forces are developed mainly in air gaps which are formed between the yoke(s) and the inner sides 13 a, b and 26 a, b, c, d , of the arms of the H-shaped bobbin body—which are here called inner air gaps.
  • the signal forces are developed in air gaps shaped on the outside 53 a, b, c, d , of the arms of the H-shaped bobbin body 51 —which are called outer air gaps.
  • the magnetic signal flux way through the yoke 52 becomes longer than in the other embodiments and thereby the losses in the iron material can be expected to be larger.
  • Another drawback is the leakage of the signal flux through the magnets 50 a, b, c, d may reduce the signal force generation.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Surgical Instruments (AREA)
  • Glass Compositions (AREA)
US10/237,391 2000-03-09 2002-09-09 Electromagnetic vibrator Expired - Lifetime US6751334B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE0000810 2000-03-09
SE0000810A SE516270C2 (sv) 2000-03-09 2000-03-09 Elektromagnetisk vibrator
SE0000810-2 2000-03-09
PCT/SE2001/000484 WO2001067813A1 (en) 2000-03-09 2001-03-07 Electromagnetic vibrator

Related Parent Applications (1)

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PCT/SE2001/000484 Continuation WO2001067813A1 (en) 2000-03-09 2001-03-07 Electromagnetic vibrator

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US20030034705A1 US20030034705A1 (en) 2003-02-20
US6751334B2 true US6751334B2 (en) 2004-06-15

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US (1) US6751334B2 (sv)
EP (1) EP1266540B9 (sv)
AT (1) ATE433260T1 (sv)
AU (1) AU3788401A (sv)
DE (1) DE60138875D1 (sv)
DK (1) DK1266540T3 (sv)
SE (1) SE516270C2 (sv)
WO (1) WO2001067813A1 (sv)

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US20040145258A1 (en) * 2001-05-17 2004-07-29 Chi-Yup An Electro-mechanical transducer
US20040236176A1 (en) * 2001-06-21 2004-11-25 Kristian Asnes Vibrator damping
US20050135651A1 (en) * 2002-05-10 2005-06-23 Bo Hakansson Means at electromagnetic vibrator
US20060045298A1 (en) * 2004-09-02 2006-03-02 Patrik Westerkull Vibrator for bone-conduction hearing
US20060078151A1 (en) * 2004-10-12 2006-04-13 Jason Kemmerer Loudspeaker having cooling system
US20070053536A1 (en) * 2005-08-24 2007-03-08 Patrik Westerkull Hearing aid system
WO2007117200A2 (en) 2006-04-12 2007-10-18 Osseofon Ab Method for the manufacturing of balanced transducers
US7302071B2 (en) 2004-09-15 2007-11-27 Schumaier Daniel R Bone conduction hearing assistance device
US20080255406A1 (en) * 2007-03-29 2008-10-16 Vibrant Med-El Hearing Technology Gmbh Implantable Auditory Stimulation Systems Having a Transducer and a Transduction Medium
US20080319250A1 (en) * 2005-02-21 2008-12-25 Entific Medical Systems Ab Vibrator
US20090245555A1 (en) * 2008-03-31 2009-10-01 Cochlear Limited Piezoelectric bone conduction device having enhanced transducer stroke
US20090310804A1 (en) * 2008-03-31 2009-12-17 Cochlear Limited Bone conduction device with a user interface
US20100054509A1 (en) * 2008-08-29 2010-03-04 Thompson Stephen C Methods and apparatus for reduced distortion balanced armature devices
US20100179375A1 (en) * 2007-05-24 2010-07-15 Cochlear Limited Vibrator for bone conducting hearing devices
DE102009014770A1 (de) 2009-03-25 2010-09-30 Cochlear Ltd., Lane Cove Schwingungserzeuger
DE102009014774A1 (de) 2009-03-25 2010-09-30 Cochlear Ltd., Lane Cove Hörhilfevorrichtung
US20110158443A1 (en) * 2008-03-31 2011-06-30 Aasnes Kristian Bone conduction device with a movement sensor
US20130106205A1 (en) * 2011-10-17 2013-05-02 Marvin L. Clamme Vibration transducer and actuator
US20150063611A1 (en) * 2013-08-28 2015-03-05 Martin Evert Gustaf Hillbratt Devices for enhancing transmissions of stimuli in auditory prostheses
US20150181344A1 (en) * 2012-06-27 2015-06-25 Goertek Inc. Electroacoustic transducer and manufacturing method thereof
US9107013B2 (en) 2011-04-01 2015-08-11 Cochlear Limited Hearing prosthesis with a piezoelectric actuator
US9432782B2 (en) 2013-03-14 2016-08-30 Cochlear Limited Electromagnetic transducer with air gap substitute
US9445207B2 (en) 2011-03-16 2016-09-13 Cochlear Limited Bone conduction device including a balanced electromagnetic actuator having radial and axial air gaps
US9699566B2 (en) * 2015-03-05 2017-07-04 Bhm-Tech Produktionsgesellschaft M.B.H. Electromagnetic signal converter for an osteophone
EP3306955A1 (en) 2016-10-10 2018-04-11 Oticon Medical A/S Hearing device comprising an automatic power swtiching
US11026032B2 (en) 2013-03-15 2021-06-01 Cochlear Limited Electromagnetic transducer with specific internal geometry
US11035830B2 (en) 2017-06-23 2021-06-15 Cochlear Limited Electromagnetic transducer with dual flux
USRE48797E1 (en) 2009-03-25 2021-10-26 Cochlear Limited Bone conduction device having a multilayer piezoelectric element
US11778385B2 (en) 2017-06-23 2023-10-03 Cochlear Limited Electromagnetic transducer with non-axial air gap

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GB2439411B (en) * 2007-04-27 2008-07-23 Perpetuum Ltd An electromechanical generator for converting mechanical vibrational energy into electrical energy
GB2446685B (en) * 2007-11-27 2009-04-01 Perpetuum Ltd An electromechanical generator for converting mechanical vibrational energy into electrical energy
SE533047C2 (sv) * 2009-03-24 2010-06-15 Osseofon Ab Benledningsvibratorkonstruktion med förbättrad högfrekvensrespons
US8538061B2 (en) * 2010-07-09 2013-09-17 Shure Acquisition Holdings, Inc. Earphone driver and method of manufacture
SE1000876A1 (sv) * 2010-08-28 2011-12-27 Osseofon Ab Miniatyriserad variabel reluktansvibrator
KR101378891B1 (ko) * 2012-08-29 2014-03-28 주식회사 하이소닉 터치 모션 스위치
US9800982B2 (en) 2014-06-18 2017-10-24 Cochlear Limited Electromagnetic transducer with expanded magnetic flux functionality
US10091594B2 (en) 2014-07-29 2018-10-02 Cochlear Limited Bone conduction magnetic retention system
US10469963B2 (en) 2014-08-28 2019-11-05 Cochlear Limited Suspended components in auditory prostheses
WO2016155812A1 (en) * 2015-04-01 2016-10-06 Osseofon Ab Electrodynamic motor assembly for bone conduction vibrators
US10130807B2 (en) 2015-06-12 2018-11-20 Cochlear Limited Magnet management MRI compatibility
US20160381473A1 (en) 2015-06-26 2016-12-29 Johan Gustafsson Magnetic retention device
US10917730B2 (en) 2015-09-14 2021-02-09 Cochlear Limited Retention magnet system for medical device
US11595768B2 (en) 2016-12-02 2023-02-28 Cochlear Limited Retention force increasing components
US11258343B2 (en) * 2018-05-21 2022-02-22 Apple Inc. Double helix actuator with magnetic sections having alternating polarities
CN116547993A (zh) 2020-12-14 2023-08-04 Bhm-技术产品有限公司 用于骨传导式耳机的电磁信号转换器
CN117412227B (zh) * 2023-02-21 2024-08-23 东莞市惟动智能科技有限公司 圈磁并联型推挽式非线性抵消的动圈振子

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DK1266540T3 (da) 2009-10-05
SE516270C2 (sv) 2001-12-10
SE0000810D0 (sv) 2000-03-09
AU3788401A (en) 2001-09-17
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SE0000810L (sv) 2001-09-10
ATE433260T1 (de) 2009-06-15
EP1266540B9 (en) 2010-03-03
EP1266540A1 (en) 2002-12-18
US20030034705A1 (en) 2003-02-20
WO2001067813A1 (en) 2001-09-13
EP1266540B1 (en) 2009-06-03

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